Iienby k



(No Model.)

H. K. GOODWIN.

ELEOTRIOI SWITCH.

N0.'324,248. Patented Aug. 11, 1885.

l/VVEA/TOR I Allorneys WITNESSES N. PETERS, Phnto-Lilhognphur. \Vashingmn. o c.

' UNITED STATES PATENT OFFICE,

HENRY K. GOODW IN, OF CLEVELAND, OHIO, ASSlG-NOR OF TEN-ELEVENTHS TO THE OHIO MOLECULAR TELEPHONE COMPANY, OF SAME PLACE.

ELECTRIC SWITCH.

SPECIFICATION forming part of Letters Patent No. 324,248, dated August 11, 1885.

Application filed March 9, 1885.

To all whom it may concern:

Be it known that I, HENRY K. Goo nwIN, of Cleveland, in the county of Ouyahoga and State of Ohio, have invented certain new and useful Improvements in Electric Switches; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in electric switches adapted to be used in a telephone system when two lines are employedto wit, a call-up line and a subscri'ccrs line; and it consists in certain features of construction and in combination Of parts, hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure .1. is aview in elevation of my improved switch and attachments, and in diagram a call-up line and subscribers line, a receiver, groundconnection, and a part of the switch-board of the central telephone-office. Fig. 2 is amodification of the switch. a

A represents the call-up line, that at the central office is connected with the receiver A, that may be held to the ear of the operator by an elastic belt. The call-up line has suitable ground-connections-for instance, at A This line is connected with each subscriber of the district, preferably by a plug-switch, as at a.

From the switchboard of the central otlice lines Nos. 1 2 3, 8m, lead, respectively, to the different subscribers, and are each connected with a lever, B. This lever in the depressed position shown in solid lines connects with the contact-spring b, but in its elevated position (see dotted lines) connects with the contact'springs b and If.

G is a switch-lever pivoted to the plate and has a handle, 0 and mounted on the other end an insulated band, a, and this end of the lever in its normal or depressed position is held connected with the contact-spring D by the spring 0. When the handle of the lever is depressed,(see dotted lines,) the lever leaves the spring D and connects with the spring F, and theband c electrically connects 50 the springs G and H.

(No model.)

It is the subscribers receiver, and E the earth-connection.

I and S are respectively the primary and secondary of the induction-coil I.

J, K, and L are respectively the subscribers telephone battery, bell, and transmitter.

When the telephone is not in use, the levers B and O are in the position shown in solid lines, so that when the battery at the central office is connected with line 1 the circuit is line 1, B, b, K, and E and connecting-wires shown, and of course calls subscriber No. 1, who, upon hearing the call, elevates the lever 13. The circuit would then be through line 1, B, b, D, G, G, S, R, and E. Subscriber No. 1 may now communicate with any other subscriber whose line is connected with his at the switch-board of the central office, after which conference the lever B is again depressed. \Vhen subscriber No. 1 wishes to call the central office, he first moves the lever B to throw battery J onto the line of the transmitter L, and then depresses the handle 0 which, as aforesaid, disconnects the lever from the spring D and connects it with the spring F, that, in turn, is connected, as shown, with the call-up line A. The circuit is then E, It, S, O, O, F, call-up line A, A, and A. In this position of the lever O the insulated band a connects the springs G and H, thus connecting the bell Kin the circuit via line 1 to the switch-board, at the same time disconnecting the lever C from the spring D, and thus disconnecting the receiver R from the switch-board line and connecting it via F with 8 5 the call-up line. It will be seen, then, by shifting the lever O, that the receiver It and the bell K are changed from the call-up line to the subscribers line, and vice versa, and that the communications of subscribers with the central office are had over the call-up line, and that communications between subscribers are had only over the subscribers lines, and that these latter communications are not heard at the central office or by any one except the two subscribers whose lines are connected at the switch-board at the central office.

This switch is simple in construction, is conveniently operated, and well adapted for the purposes for which it is intended.

IOO

In Fig. 2 a modification of the switch is shown, where, instead of the band 0, for connecting the springs G and H, the latter being always connected, as shown, by a wire with the spring D, the spring G is placed in such position behind the spring D that when the lever is raised from contact with the spring D this spring recoils, so that it is in contact with the spring G, and connects the bell in the same manner as before.

\V hat I claim is 1. The combination, with the contact-spring F, connected with the call-up line, and contacts 'irings H G, included in the circuit with the bell and receiver, of the lever 0, plate 0, contact on the lever for connecting springs H G, and the contact-spring D, the latter in the circuit including the transmitter, substantially as set forth.

2. In a telephone system consisting of a call-up line and subscribers lines, the lever 0, provided with insulated band 0, in combina- I tion with the contactsprings G and H, arranged to engage the band, and the spring F, to engage the lever on the one side, and the spring D, arranged to engage the lever when reversed, and connecting-wires, substantially as shown, and a spring, 0, for holding the lever in contact with spring D, of a spring connected with the bell, and arranged to engage or disengage the spring D, according to the position of the lever C, snbstantiall y as set forth.

In testimony whereof I sign this specification, in the presence of two witnesses, this 5th day of March, 1885.

HENRY K. GOODVVIN.

W'itnesses:

CHAS. H. DORER, ALBERT E. LYNCH. 

